A table set of Inclination and Azimuth at select points of trajectory, measured as length $\begin{array}{l}l\end{array}$ of trajectory from some Logging Reference Point:

Measured Depth	Inclination	Azimuth
$\begin{array}{l}l\end{array}$	$\begin{array}{l}\theta\end{array}$	$\begin{array}{l}\alpha\end{array}$
...	...	...

which allows to reconstruct the position vector $\begin{array}{l}\bf r\end{array}$ at each point $\begin{array}{l}l\end{array}$ of trajectory:

Measured Depth	Easting	Northing	TVDss
$\begin{array}{l}l\end{array}$	$\begin{array}{l}x\end{array}$	$\begin{array}{l}y\end{array}$	$\begin{array}{l}z\end{array}$
...	...	...	...

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See also